Stock-cutting machine



which will cut relatively soft stock in an Patented Sept. 2, 192.4.

UNITED I STATES LoisneoTrMoLLaa'r, or WATER-TOWN, Wisconsin.

Application filed March 23,

T 0 azz whom it may concern:

Be it known that I, LOBEGOTT MOLLART, a citizen of theUnited States, and resident of Watertown. in the county of Jefferson and State of Wisconsin, have invented certain new and useful Improvements in Stock- Cutting Machines; and I do hereby declare that the followingis a full, clear, and exact description thereof.

This invention relates to stock cutting machines and is particularly directed to a machine forcutting rubber stock.

Machines as heretofore constructed for cutting the rubber stock furnished rubber heel manufacturers have not been wholly satisfactory as they distorted the stock and made an irregular slanting or tearing cut; obviously, therefore, the resulting slice of stock was uneven and irregular and not suited for the'purpose intended.

This invention is designed to overcome the abovelnoted defects, and objects of such invention are, therefore, to provide a machine even and smooth mannerwhich will not distort the stock during the cutting operation, which may be adjusted to accurately cut the exact thickness required, which is easyto operat'e, and which makes a cut by a shearing stroke.

, Further objects are to provide a machine .for cutting rubber stock which is extremely simple in construction, which may be readily produced, which is equipped with a knife, a portion only of which may be used for a given period, and which may thereafter be shifted to present. a fresh or sharp surface, 'and which is so constructed that-the knife may be readily removed and re-sharpened. An embodiment of the invention is shown in the accompanying drawings, in which Figure 1 is a sectional elevation of the machine such view corresponding roughlyto a section on a line'11 of Figure 2.

Figure 2 is a plan view of the machine. The machine comprises a basei to which a pair of curved brackets 2 are bolted. A

'3. A lever is rigidly secured to the shaft 3 tively long arm 6 terminating in a handle 7 and is provided, with an upstanding relaure 2.

PATENT ;F

s'rocx-oorrmo MACHINE.

of links or' arms18 which are in turn joined and braced by a transversely extending channel member 14 as may 'be'seen from'Fig ure 1. The outer ends ofthe arms 13 are carried by means of rollers 15 mounted upon a transverse shaft 16 journaled in such arms. These rollers are adapted to travel across the upper smoothsur'face of the bed plate 1 when the lever 6 is operated. The other ends of the arms. 13 are pivotally joined to the downwardly projecting extension 8 of'the lever and to a corresponding lever 17 rigidly carried by the left hand end of the transverse operating shaft 3 as shown in'Fig- The outer end of the right hand arm or link 13 has pivotally joined thereto a bracket 18 which is yieldingly pressed by meansof aspring 19, (see Figure 2). This bracket carries a supporting arm 20 which is rigidly.

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attached thereto and is adaptedto bear against the outer face of the circularknife if as maybe seen from Figure 2.. It is contoured to correspond to the trough 11 and is adapted to support the projecting end of the stock during the cutting operation." An 'adjustable limit 21 isprovided for the arm 20 to hold such arm 20 in slightly spaced relation when not in contact with the knife 41. This limiting device may conveniently be a bolt or screw as shown suitably equipped with a lock nut.

A bracket 22 is rigidly secured to the righthand face of the base or bed plate and adjustably receives the threadedspindle 23 of a gauge plate 2 1 against which the stock is adapted to abut. Theouterend of the spindle 23 may be conveniently provided with handwheel 25 to facilitate adjustment. The bracket 22, as may be seen from Figure 1 is slotted and is bolted through this slot to the bed plate to provide the necessaryadjustment for varying sizes of stock. t

The operation of the apparatus is asfollows :-Thestock is placed in the trough 11 as shown, and the operator shoves the stock towards the right into contact with the gauge plate or stop 24 and grips the handle 7 with his right hand. He then rocks the lever 6 until its center line occupies the posi tion shown by the imaginary line in Figure 1. This, it will be noted, gives the rotary knife 4 a one-eighth turn. While the knife is executing this movement, the carrier is drawn inwardly towards the knife thereby presenting the stock to the knife and allowing it to be subjected to a shearing out.

The stock, it will be noted, is relatively soft and easily distorted and, therefore, the slanting shearing cut is highly desirable. In addition to this, the smoothness of the cut is further insured by the relativeby narrow support immediately adjacent the outer face of the knife. This support, together with the support or trough 11 fur- :nishes the necessary support for the soft stock immediately adjacent the knife and on opposite sides thereof, so as to eliminate distortion. It is further apparent that when the out has been com leted the carrier will have moved its greatest distance inwardly and the cut portion of the stock will be clear of the stop or gauge plate 24: and con sequently will freely fall from the machine.

When the active portion of the knife has been dulled by a large number of opera-- tions, the nut 5 may be loosened and the knife may be given a partial turn to present a fresh surface. Obviously the knife is turned in the same direction at each adjustment so as to continuously present new surfaces until th entire edge of the knife has been utilized. When the entire edge of the knife has become dull, the knife may be readily removed from the shaft 3 and resharpened in an extremely simple and easy manner.

It is to be noted that the weight 9 acts as a pendulum and when the operator is continuously oscillating the lever 6, the weight stores a certain amount of energy and aids in the periodic swinging of the lever and actuation of the knife. In fact in actual practice it has been found that a man may readily operate this machine in an extremely rapid and easy manner and that the severed material is uniform and has accurately parallel smooth faces.

This soft rubber stock, after it has been sliced into these relatively smaller portions, is designed for use in the production of rubber heels and similar articles and as is well known it is desirable that the utmost accuracy in the cutting of these portions be maintained.

It will be seen, therefore, that a machine has been provided which will rapidly and accurately cut soft and easily distorted stock, which may be most readily manipulated, and which is adjustable to present fresh knife surfaces for the active portions.

It is, of course, obvious that a power drive may be readily applied to a machine of this type and that other variations may be made. It is, therefore, intended that although the invention has been described in considerable detail, it is not to be limited except as defined in the appended claims.

I claim:

1. A stock cutting machine comprisin a circular knife, a lever for rotating sa i knife back and forth through a portion of a turn, a carrier for supporting the stock closely adjacent the knife, and mechanism operatively coupling said carrier and knife to reciprocate said carrier as said knife is oscillated, whereby said stock is presented to said knife while said knife is being eillated.

2. A stock cutting machine comprisingn revolubly mounted knife, a lever for rotating said knife back and forth through a portion of a turn, a reciprocatory carrier having a trough-like portion for support-in mid stock, link mechanism connecting sai lever. and carrier and adapted to reciprocate said carrier to present said stock to said knife, and ajsupport spaced from the end of said trough-like portion for supporting the projecting portion of said stock, whereby said stock is supported upon opposite sidesof said knife while it is being cut.

8. A stock cutting machine comprising a bed plate, a transverse shaft sup-ported therefrom, a circular knife adjustably mounted upon said shaft, a lever rigidly mounted upon said shaft and having an operating handle at one end, a counterweight carried by said shaft and extended radially downwardly therefrom, a reoiprocatory carrier mounted upon the upper side of said bed plate and having an elongated support for said stock, and link mech anism connecting the forward portion of said carrier with said shaft, whereby when said knife is rocked through a portion of s a turn of said lever said carrier is advanced towards said knife.

4. A machine for cutting elongated rubber stock comprising a bed plate, a transversing operating shaft carried by said bed plate, an operating lever rigidly attached to said shaft and terminating in an operating handle, a pair of relatively short levers projecting downwardly from said shaft, 9. carrier including a air of members hose forward ends are pivo-tally joined tosa-id pair of levers, means for support' the other end of said members from said 'bed plate, a. support projecting beyond said carrier and adapted to support the projectin portion of the rubberstock, a circular kni e adijustably mounted upon said tranversolv shaft and adapted to be spaced between said carrier and said support, resilient means for yieldingly urging said support into contact with the outer face of said circular knife.

5. A machine for cutting elongated rubber stock comprising a carrier including apair of arms, a trough-like member carried by said arms, a support conforming to said trough-like member and spaced from the outer end thereof a slight distance, an adjustable stop supported from a stationary portion of said machine and adapted to align with said trough-like member in one position of the latter, a transverse operating shaft paralleling said trough-like member, a circular knife secured thereto, an operating lever rigidly attached to said shaft, a pair of shorter levers rigidly attached to said shaft and pivotally joined to said arms, and a downwardly extending counterweight rigidly carried by said shaft.

In testimony that I claim the foregoing I have hereunto set my hand at Watertown,

in the county of Jeiferson and State of Wis- 20 cousin.

LOBEGOTT MOLLART. 

